Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quem foi o oponente antes da semana 6 no estádio municipal de Cleveland?
 ###Tabelas: CREATE TABLE match_attendance (match_attendance_id AUTO_INCREMENT PRIMARY KEY, Venue VARCHAR, Hosted INT, Average INT, Highest INT, Lowest INT, Total INT, Last Year VARCHAR, Up/Down VARCHAR) CREATE TABLE minnesota_counties_ranked_by_per_capita_income (minnesota_counties_ranked_by_per_capita_income_id AUTO_INCREMENT PRIMARY KEY, County VARCHAR, Per capita income VARCHAR, Median household income VARCHAR, Median family income VARCHAR, Population INT, Number of households INT) CREATE TABLE support_of_leading_parties_and_blocs_by_administrative_regions (support_of_leading_parties_and_blocs_by_administrative_regions_id AUTO_INCREMENT PRIMARY KEY, Region VARCHAR, Voter registration INT, Voter turnout INT, BYuT INT, OU-PSD INT) CREATE TABLE regular_season (regular_season_id AUTO_INCREMENT PRIMARY KEY, Week INT, Date VARCHAR, Opponent VARCHAR, Result VARCHAR, Game site VARCHAR, Record VARCHAR, Attendance INT) CREATE TABLE support_of_leading_parties_and_blocs_by_administrative_regions (support_of_leading_parties_and_blocs_by_administrative_regions_id AUTO_INCREMENT PRIMARY KEY, Region VARCHAR, Voter registration INT, Voter turnout INT, BYuT INT, OU-PSD INT)  
SELECT Opponent FROM regular_season WHERE Week < 6 AND Game site = cleveland municipal stadium